Process for extracting sulphur from spent oxide from gas plants



Dec. 18, 1923; 31,478,]184) A. GIVEN PROCESS-FOREXTRACTING SULPHUR FROMSPENT OXIDE'EROM GAS PLANTS Filed Nov. '21, 1918 5 sheets-Sheet 1 Dec,18,1923. M78180 -A. GIVEN PROCESS FOR EXTRACTING SULPHUR FROM. SQPE NTOXIDE FROM GAS PLANTS- Filed Nov.- 21, 1918 5 Sheets-Sheet 2 Dec. 18,11923.

A. GIVEN PROCESS .FOR EXTRACTING- SULPHUR-FRZDMSBENT OXIDE FROM GASPLANTS Filed Nov. 21, 1918 5 Shets-Sheet 3 A TTORNE w,

Dec. 18 ,19

23. mmn w A. GIVEN PROCESS FOR EXTRACTING SULPHUR FROM SPENT OXIDE FROMGAS PLANTS QR I {a i Filed Nov. 21, 1918 5 Sheets-Sheet 4 Dec. 18 1923.

YA. GIVEN PROCESS FOR EXTRACTING SULPHUR FROM SPENT OXIDE FR M (msPLANTS Filed Nov. 21, 191 8 5- Sheets-Sheet s l I v gas Patented Dec.18, 1923.

ARTHUR- GIVEN,

COMPANY, on NEW YORK, N. Y.;

T PATENT HQE;

OF NEWARK, -NEW JERSEY, ASSIGNOR TO STEVENS-AYLSWORTBI A CORPORATION OFNEW YORK.

PROCESS FOR EXTRACTING' SULPHUR FROM SPENT OXIDE FROM GAS PLANTS.

\ Application filed November 21, 1918. SeriaiNo. 263,474.

T 0 all whom it-may concern:

Be .it known that I, ARTHUR GIVEN, a

citizen of the United States, and a resident of Newark; in the county ofEssex and State of New Jersey, have invented certain new and usefulImprovements in Processes for Extracting Sulphur from Spent Oxide fromGas Plants, of which the following is a specification. v

My invention has for its object the extraction of sulphur from spentoxide from works by an improved and novel process by means of which theextraction is thoroughly and-quickly effected atsmall cost and withoutwaste of the solvent employed for the purpose of extraction, myinvention being more particularly an improvement on the invention shownand described in my prior Patent No. 1,404,199, dated January 24, 1922.i

A further object of myinvention is the extraction of sulphur from spentoxide from gas-works in-a continuous manner that is without interruptionof the process for the purpose of charging the device by means of whichthe process is practiced with oxide or discharging it therefroinonfiirany other reason.

Other and further objects of my invention will appear' from theaccompanying de- 'scription, the invention consisting in the novelprocess hereinafter more particularly described and then specified inthe claims.

. matically:

In the accompanylng'drawings which illustrate the invention more or lessdiagram- Fig. 1 is a paratus for extracting sulphur from spent oxidesfrom gas works by my improved process. v

Fig. 2 is'an enlarged view of a portion of the apparatus showing two ofthe extractor tanks and the connectionstherebetween as well as one ofthe condensers.

Fig. 3 is a further enlarged view of one of the extractor tanks.

Fig. 4 is an enlarged view of the portion of the apparatus embodying oneo1 the stills and the condenser connecting therewith.

ffigures of the drawings,

"tanks has connected oxide may be removed front elevation of the new ap-Y Fig. 5 is an enlargedview of the solvent tank with the adjacentpressure regulating tanks and air blower.

Referring more particularly to the several l'to 12 inclusive indicate aseries or plurality of extractor tanks arranged side by side andsupported in any desirable manner and adapted to hold the oxide fromwhich the sulphur is to be extracted. Each of said extractor therewith asolvent heater 1 to 12 respectively inclusive for heating the solventemployed in the extraction process. One of the extractor tanks, forinstance extractor tank 1 with the connecting heater 1' (see Fig. 3)will be described in' detail it being understood that all the extractortanks and heaters are identical in construction.

The extractor tank 1 is provided with a conventional form ofsteam-jacket 1 having an inlet steam-pipe 1 and an exhaust steam-pipe 1each of which is provided with a suitable cock. The tank is alsoprovided with an inner false bottom 1 the construction of whichis-preferably a wood grating covered with burlap and the 'function ofwhich is to receive and support" the oxide and to prevent the fineparticles thereof from entering the piping systemof the apparatus. Theextractor tank is also 'provided' with a removable cover 1 having anair=pipe 1 with a suitable cock thereon, said extractor tank being alsoprovided with a delivery opening having a removable cover or closure ltherefor (Fig. 3) so that the from the tank when the extraction'jiscompleted:

The solvent heater 1 isprovided, as are all of said solvent heaters,pipes 1 and a steam-jacket with suitable inlet and outlet steam-pipes 1and 1.

Each of the extractor tanks 1 to 12 inclusive is provided with verticalpipes 1 to 12 inclusive connecting withthe bottoms of the extractortanks and provided with suitable cocks 1 to 12 inclusive, said verticalpipes being joined together by asaturated 13. Likewise, the bottom of.

solution pipe each of said heaters 1 to 12' is respectively providedwith pipes 1 to 12 inclusive connecting therewith and having suitablecocks with the interior.

ion

1 to 12 therein, said pipes being joined together by solvent pipe 14.Connecting with the top of the heaters l to 12 inclusive are pipes l to12' inclusive provided respectively with cocks 1 to 12 said pipes 1 to12? inclusive being all connected together by'the compressed air pipe15.

Joining together and making connection between the bottoms of thesolvent heaters 1 to 12' inclusive and the pipes I to 12 of theextractor tanks 1 to 12 is the pipe 16. The ends of said pipe 16 areconnected together although they are shown as broken away in thedrawing.Connecting the tops of the'extractor tanks 1 to 12 inclusive with eachof its adjoining solvent heaters 1 to 12 inclusive respectively are theshort horizontal pipes P to 12 inclusive, and connecting the pipes 1 to12 inclusive and pipe 16 are the vertical pipes 1 to 12 inclusiverespectively. The pipe 16 is provided therein with 12 series of threecocks 1 1 1 to 12 12 12 inclusive respectively for each of the extractortanks and heaters, said,cocks being arranged in the pipe 16 in thepositions illustrated. Each of the pipes 1 to 12 is likewise providedwith two cocks 1 1 to 12 12 respectively. Vhile the smallness of thefigures and particularly Fig. 1 will not readily permit of the markingof each individual part and each separate cock, it will be understoodthat the numbers with the same exponents refer to the cock, pipe orother part for each extractor tank andsolvent heater as the. cock, pipeor part occupying the same relative position and bearing the samenumberv for extractor tank 1 and solvent heater 1. This it will beunderstood applies equally well to other parts of the apparatus to behereinafter described and referred to by the same numbers but saidnumbers having different exponents.

The tops of the extractor tanks 1 to 12- have connected therewith pipes1 to 12" respectively which are connected with pipes '1 to 12joiningtogether the upper and lower parallel extractor vaporpipes 17 and.18. The pipes 1 to 12 each has two cocks therein 1 1 to 12 12respectively (see Fig. 2). The said extractor vapor' pipes 17' and 18are respectively connected by means of pipes 19 and 19' to thecondensers 20 and 20' the interior pipes and parts of which are notshown, said condensers being also provided with the usual inlet andoutlet water pipes. The outlet pipes 21 and 21 through which thecondensed solvent flows as will hereinafter be explained is joined tothe tops of sight-boxes 2 2 and 22 preferably provided withsight-glasses or lunettes in either of the sides thereof. The bottoms ofthe sight-boxes 22 and 22 are connected by pipes 23, 23 to the mainsolvent pipe' 24 which in turn is connected by ara-rec a pipe 25 to thesolvent pipe 14. (See Fig. 1.)

26 indicates the main solvent "supply tank (see Fig. 5) which isconnected at its bottom with the solvent pipe 24. Said solvent supplytank is supplied with the usual gauges so that the amount of solventtherein may be determined by visual inspection. The tank is alsoprovided with an inlet 28 adapted to be connected with asuitable sourceof solvent supply. 29 indicates an air pressure equalizing pipeconnecting with the solvent tank 26 as illustrated as well as with otherparts of the system so that the pressure therein will remain the same.Said pipe 29 is also connected with one 'of-two pressure regulatingtanks 30 and 3-1,similar in construction to, and having the samefunction as, those described in my previous application for patent abovereferred to. Joining the two pressure regulating tanks at their lowerends is a pipe 32 having a suitable cook 33 therein so that water may beforced in said tanks or allowed to drain therefrom. Tank 31 ispreferably provided with suitable gauges as shown, so that the amount ofwater said tanks may be ascertained visually, and said tank is connect-'ed adjacent itstop by pipe 34 with a closed scrubber 35. said pipe 34extending downwardlv through the closed top of the scrubber (Fig. 5) andterminating adjacent the bottom thereof. The said scrubber is providedwith an air pipe 36, an outlet 37, with a suitable cocktherein, and alsoa gauge on the side thereof so that the height of the level of theliquid therein may be determined.

38 indicates a suitable compressed air tank connected by pipe 39 withthe compressed air pipe'15. Connected also with the compressed air tank38 is a blower 40 so that compressed air may be forced into' pipe 39 andpipe 15 when so desired.

On either side of the apparatus and forming a part thereof are locatedthe measuring tanks 41 and 41 connected by pipes 42 and 42"respectivelywith the saturated solution pipe 13. Said pipes 42 and 42" have cocks 43and 43 therein as illustrated. Connect- 1 ing with the tops of themeasuring tanks are the pipes 44 and 44' provided respectively withsuitable gauges as shown. Said pipes 44. 44 are connected with airpressure equalizing pipe 29 (see Fig. 2) and their ends extenddownwardly into the sight-boxes 45 and 45. said sight-boxes beingprovided with sight-glasses or lunettes as are the sight-boxes 22, 22.46, 46 indicate pipes connecting respectively with the pipes 23 and 23and 47, 47 are pipes connecting respectively the pipes 44, 44 and 21,21.

48, 48' indicate stills which are provided with suitable steam-jackets(not shown) and having as; j

steam inlets and outlets for said jackets as indicated. Said stills arealso outlet pipes 49, 49' which are provided with cocks or valves whichmay be closed or opened as desired. The said stills 48, 48 are connectedrespectively with the measuring tanks 41, 41' by pipes 50, 50 havingsuitable cocks 51, 51' therein.

48, 48 are connected by The stills pipes 52, 52 to the condensers 53,53', the

' interiors of which are not shown, and which a are provided with theusual inlet and outillustrated. Said conjoined to closed Waterwhich letwater pipes as, densers 53', 53' are separators 54, 54 by pipes 55, 55

extend downwardly therein. The water-' separators'arecon'nected adjacenttheir tops, with the pipes 44, 44 by the condensed solvent pipes 56, 56.Connected also with the water-separators 54, 54' adjacent their bottomsare the short pipes 57, 57' which in turn are connected respectivelywith the counterbalancing pipes 58, 59 and 58, 59.

The said counterbalancing pipes 59, 59 are connected with the sewerpipes 60, 60". To insure that the air in counterbalancing pipes 59,59xis under atmospheric pressure, said pipes are provided in their upperends with the open pipes 61, 61"-. The tops of the water-separators 54,54 and the tops of the short pipes 57 57 are also respectivelyjoinedtogether by connections 62, 62 so that the pressure in saidWater-separators and said short pipes will be the same in order toprevent siphoning of the liquid in the water-separators over into thecounterbalancing pipes? My improved process of .extraction is practicedas follows:

The solvent tank 26 is filled with solvent.

which is preferably benzol although the invention is not limitedthereto. The condensers 20,- 20, 53 and 53 are filled with Water, thepressure regulating tanks 30, 31 about half filled with water, thescrubber 35 partly filled with oil, and extractor tank 1 is charged withoxide or other substance from which the sulphur is to be extracted.

Assuming all the cocks in the system are closed, the cock in'air pipe 1of extractor tank 1 is opened and then the cocks 1, 1

and 1. As is obvious, the solvent in the tank 26 then flows by gravitydown through,

pipe 25, through the solvent pipe 14 up through the pipes in the heater1', down through pipe 1 through pipe 16 and up 1 driving the air throughextractor tank out of said tank before it and up through airpipe 1. henthe solvent appears at 1*, the cock therein is closed as wellas-the cock1 as the extractor tank is then filled with solvent. The solvent isallowed to remain in the extractor tank for from twenty to thirtyminutes and by .its solvent action it extracts a large amount the axe

of sulphur from the oxide in the tank, the eiiicacy of the extractionprocess being greatly increased by the heating of the solvent whenpassing through the heater 1'. After the solvent remains in theextractor tank for a sufficient time, cock 1 is opened as well as cocks1 2 2 and the cock in air pipe 2 of extractor tank 2. Obviously then,the solvent in extractor tank 1, partly saturated with sulphur, isforced, by fresh solvent which flows into extractor tank '1, up throughheater 2', becoming reheated therein, down through pipe 2 and up throughthe extractor tank 2 which has meanwhile been filled with oxide, anddrives from the extractor tank before it.

the top of and fills extractor tank 1 as is apparent.

W'hile extractor tank 3 is being filled with oxide, cook 43 in pipe 42and cook 2 in pipe 2 are opened. The solvent in extractor tank 2 thenhaving passed through both extractor tanks 1 and 2 and havingbecomesaturated with'sulphur, is allowed to flow through pipe 2 throughsaturated solution pipe 13, up through pipe42 and into the measuringtank 41. 'When the measuring tank has become filled, which is determinedby an inspection of thegauge on the side thereof, cock 43 is closed andcock 51 in pipe 50 isppened thereby permitting the saturated solution inthe measuring tank to fiow into the still 48. The cock 51 is then closedand 43'again opened and measuring tank 41 again filled by gravitydue tothe head of the liquid in the .tank 26 and contents of tank 41 is againpermitted to flow into the still. In other words two draws are takenfrom the extractor tank 2 and permitted to flow in the manner describedinto the still and after the second draw the cocks 2 and 51 are closed.Obviously, as each drawtis made from extractor tank 2, the partlysaturated solvent in extractor tank 1 flows into extractor tank 2 andfreshsoh vent flows into-extractor tank 1, the solvent of course passingup through the heaters and down through the top of the extractor tanksas has been explained.

After the two draws of solvent have been taken from extractor tank 2 theproper cocks adjacent extractor tank 3 are opened to permit the solventin extractor tank 2 -is permitted to flow therein. Three drawsare thentaken from extractor tank 3 while t0 flow up through heater 3 and upthrough I odd numbered tanks.

number 4 is being filled with oxide, the process being continued untilextractor tank 9 is reached and two and three draws being takenalternately from the extractor tanks, that is two draws from theevcnnumbered tanks and three draws from the Meanwhile after three draws havebeen taken from extractor tank 3 distillation is started in the still48, it then containing five draws of saturated solvent. Steam is" turnedinto the steam-jacket of the still to heat the same and vaporize thesolvent to leave the sulphur free. The solvent vapor 'flows up throughthe pipe 52, through the pipe in the condenser 53 and thence into thewater-separator '54 in liquid form. Inasmuch as benzol is lighter thanwater the condensed solvent floats therein in the water-separator untilit reaches the level of the condensed solvent. pipe 56- when it flowsthrough said pipe, through .the sight-box 45, through pipe 46, pipe 24and back again into the solvent tank 26 or down through pipe as the casemay be. The excess water in the water-separator 54 flows up through thepipe 57 through the counterbalancing pipes 58, 59 and then off throughthe sewer pipe 60. I have found the inclusionof the counterbalancingpipes quite necessary to the proper practicing of my improved processand through which pipes the water in the water-separator flows or drainsoff, for the reason that thus the necessary pressure in the system isretained. This condition would not obtain if thewatc-r flowed directlythrough a single pipe leading from the water-separator or if it floweddirectly to the sewer pipe.

en distillation of the solvent has begun the system becomes filled withsolvent vapor, all parts being connected together, which may cause unduepressure unless means are provided for the escape of air. Such means areprovided and consist in the pressure regulating tanks and. 31 and thescrubber and which permit the air to escape withv out loss of thesolvent vapor. When the pressure in the system becomes unduly high, thecock or valve in the pipe 36 of course always being open, the water intank 30 is forced into tank 31 through pipe 32 and when tank 30 isempty, the air collecting a part of the solvent vapor mixed therewithbubbles through the water in 31 and flows through thepipe 34 and intothe oil in the scrubber 35. Tle oil retains or absorbs the solvent butthe air rises upthrough the oil and escapes out of pipe 36. When the oilis sufficiently saturated with solvent, it maybe drawn off through pipe37 and the solvent recovered by distillation of the mixture in anysuitable still.

After two draws have been taken from exti actor tank 8 and fresh solventallowed to run into extractor tank 1, the same process and the extractortank 9 is connected with extractor tank 8 as in the previous case. Thesulphur in the oxide in extractor tank 1 having now been all extracted,cock 1 is closed and clock 1 and 1 opened and the blower 10 operated toforce the compressed air in tank 38 through pipe 39, compressed air pipe15 and into the top of heater 1 thereby forcing the solvent thereinthrough'pipe 1 into the top of extractor tank- 1 and driving out before-1t all of the solvent in the extractor tank 1 into the next succeedingheater and extractor tank, the same operation taking place in the caseof all the heaters and extractor tanks so that extractor tank 9 isthereby filled by solvent from the preceding tank and extractor tank 1is practically emptied of solvent. Cocks 1*, 1"- and 1 are then closedand cook 2 opened to permit more solvent to flow into heater 2 afterwhich three draws are taken from extraotor tank 9. The-proper cocks arethen opened or closed as the case may be, so that the solventsupply'tank is cut out, extractor tank 10-filled with solvent from thepreceding tank bygcompressed air as was extractor tank 9, this processbeing continued from tank to tank in an obvious manner, while at thesame time the distillation ofthe solvent vapor flowing from still 48 andthe recovery of the distilled solvent continues without interruption.Obviously then, when extractor tank 9 is reached, and as each newextractor tank on the right of the system is put into operation, oneextractor tank on the left is cut out. When extractor tank 1 has beencut out itis desirable to recover what solvent remains therein beforethe oxide with the sulphur extracted is removed therefrom. This is doneby allowing steam to enter the jacket 1* of the extractor tank to heatthe same and opening the cock 1 in pipe 1 while at the same time openingcocks 1 andv 1 and slightly opening cock 18 and forcing a gentle currentof heated air up into the extractor tank through the bottom thereof. Thesolvent vapor then flows from the extractor tank through pipes 1 and 19and through the condenser 20, the condensed solvent then flowing throughthe sight-box 22 through pipes 23 and 24 and back into the solvent tank26 or through pipe 25. When distillation has been completed and all thesolvent in extractor tank 1 recovered which may be determined by notinga cessation of flow of distilled solvent through sight-box 22,'the cock1 is closed as well as cocks 1 1 and 1 and the steam is also turned offin the jacket 1*. The oxide in the extractor tank 1 may then be removedthrough the delivery opening 1 Beforethe remaining solvent in extractortank -1.has been recovered by distillation, as

just described, and the oxide removed therefrom, extractor tank- 2 hasbeen cut out and is ready for the same steps. When the extractor tank 2is heated, however, the cock 2 in pipe 2 is opened instead of cock 2 sothat the solvent vapor from extractor tank 2 flows through pipes 18, 19and through condenser 20, and the distilled solvent thence flows throughpipe 21, sightbox 22, pipe 23, pipe 24 and into the solvent tank or pipe25. Thus the recovering of the solvent remaining in the extractor tanksand the.'removal of the oxide from the tanks maybe eflectedsimultaneously with two of the tanks. Bythe time tank 3 is cut out allthe solvent remaining in tank 1 has been recovered so that tank 3 isconnected with condenser20, the purpose being to use 0011- denser- 20 inconnection with the recovery of the remaining solvent in the oddnumbered tanks and condenser 20" in connection with the recovery of theremaining solvent in the even numbered tanks After the extractor tank 12has been reached in the practicing of the process,-

extractortank 1 has been re-charged with oxide and extractor tank, 12 isthen connec ted with the heater 1 of extractor tank 1, ithavingbeenheretofore explained that pipe 16 is a. continuous and endless one,it being shown however, broken away in the ,drawing (Fig, 1). As ismanifest, therefore, theprevious steps can be repeated and eachextractor tank charged, out out and discharged in the manner previouslyex-- plainedso that the process may be continued indefinitely exceptthat stills 48 and 48 are used alternately as will now be ex-'distillation of the solvent in still 48 is still continued until all thesolvent therein has been recovered which may be determined by observinga cessation of flow of distilled solvent through the sight-box 45. Afterthe solvent has all been recovered the heatin ofthe still 48 iscontinued to melt the su phur. therein, after which it may be drawn Offin liquid form from outlet pipe 49, cooled and then broken up forshipment.

When the sulphur has been extracted from the twelve tanks a second time,still 48 1s cut out and still 48"cut in, in an obvious manner, theextracted. sulphur having by that time all been removed from still 48.

What Iclaim as my invention 1s:

1. The'herein described process of extracting sulphur from a substancewith which it is mixed consisting in placing the substance in a suitabletank, permitting a solvent to fiow into said tank to displace the airtherein and to submerge saidsubstance and intermittently permittingadditional solvent to flow into said tank to displace the solventpreviously .held therein until the extraction of the sulphur from thesubstance has been completed, the substance at all times being submergedin solvent during the extractionprocess.

2. The herein described process of ex tracting sulphur from a substance'with' -which it'islmixed consisting in placing the substance in asuitable tank, permitting so1- vent to flow up through the bottom ofsaid tank to displace the air therein and to submerge said substance andintermittently permitting additional solvent to flow into the top of thetank to displace the solventupreviously held therein until theextraction of the sulphur from the substance has been completed, thesubstance at all times being sub-- merged in solvent.

3. The hereindescribed process of extracting sulphur firom" a substancewith which it is mixed consisting in placing the substance in a suitabletank, permitting heatedsolvent to flow up-through the bottom of saidtank to displace the air therein and to submerge the substance andintermittently permitting additional heated solvent to flow into the topof the tank to displace the solvent previously held therein until theextraction of the sulphur from the substance has been completed, thesubstance at all times being submerged in solvent.

4. The herein described process'of extracting sulphur from a substancewith which it is mixed consisting in placing the substance in a luralityof tanks, permitting a solvent to o-w up through the bottom of'and intoone tank'and then when par-. tially saturated with sulphur, forcing itdownthrough said tank and'up through the vbottom of the next succeedingtank by the admission of fresh solvent in the first tank and drawing edthe solventlafter it has become saturated with sulphur extracted fromthe substance. I

tracting' sulphur from a substance with which it is mixed consisting inplacing the substance in a plurality of tanks, permitting a solvent toflow through a heater and into the first of said tanks, permitting thepartiallysaturated solvent to flow through a 5. The herein describedprocess of ex seconc heater and into the next succeeding tank whilesimultaneously permitting fresh solvent to flow into the first tank,continuing the process as to as many of the re maining tanks as arenecessary to saturate the solvent with sulphur, then drawing oil thesubstance in said additional tank with a solvent in the same manner.

7. The herein described process of extracting sulphur from a substancewith which it is mixed consisting in placing the substance in a seriesof tanks, permitting a heated solvent to flow through the first of theseries of tanks and then successively through the remaining tanks,connecting a new tank to the series and permitting the solvent to .flowtherethrough when all the sulphur from the substance in the first tankhas been extracted, cutting the first tank out of the series andthereafter continuously repeating the same cycle of operations.

8. The herein described process of extracting sulphur from a substancewith which it is mixedeonsisting in placing the substance in a series oftanks, permitting a solvent to flow through the first of the series oftanks and then successively through the remaining tanks, drawing off thesolvent when it'has become saturated with sulphur and separate ing thesolvent from the saturated solution to leave the sulphur free,permitting additional solvent to flow through said tanks, adding a newtank to the series when all the sulphur from the substance in the firsttank of the series hasbeen extracted, cutting the first tank out of theseries and thereafter continuously repeating the same cycle of operations while at the same time permitting additional solvent to flowinto the tanks whenever necessary.

9. The herein described. process of extractin sulphur from; a substancewith which it is mixed consisting in placing the substance in a seriesof tanks, permitting a heated solvent to flow through the first of I theseries of tanks and then successively through the remaining tanks,permitting the solvent when it has become saturated with sulphur to flowinto a suitable still, recovering the solvent by distillation from thesaturated solution to leave the sulphur free, adding a new tank to theseries, when all the sulphur-from the substance in the net/easesubstance in a series of tanks, permitting a solvent to flow through thefirst of the series of tanks and then successively through the remainingtanks, connecting a newtank to the series-and permitting the solvent toflow therethrough when all the sulphur has been extracted from thesubstance in the first tank, forcing the solvent remaining in the firsttan'k into one of the succeeding tanks by fluid pressure, cutting thefirst tank out of the series and thereafter repeating the same cycle ofoperations as to the remaining tanks. v

' 11. The herein described process of extracting, sulphur from asubstance withwhich it is mixed consisting in placing the substance in aseries of tanks, permittlng a solvent to flow through the first of theseries of,..,t{a'nks and then successively through the remaining tanks,connecting a new tank to the series and permitting the solvent to flowtherethrough when all the sulphur has been extracted from the substancein the first tank, forcing the solvent remaining in the first tank intoone of the succeeding tanks by fluid pressure, cutting the first tankout of the series and thereafter repeating the same cycle of operationsas to the remaining tanks while simultaneously recovering bydistillation any solvent remaining in the tanks containing substancefrom which the sulphur has been extracted.

12. The herein described process of extracting sulphur from a substancewith which it is mixed consisting in placing the substance in a seriesof tanks, permitting a solvent to flow through the first'of the seriesof tanks and then successively through the remaining tanks, drawing offthe solution of solvent when saturated with sulphur and recovering thesolvent therefrom by distillation to leave the sulphur free, permittingadditional fresh solvent to flow into the first tank and then throughthe ,succeeding tanks, connecting a new tank to the series when all ofthe sulphur has been extracted from the substance in the first tank,forcing the solvent in the first tank into the succeeding tanks'by fluidpressure,-cutting the first tank out of the series and repeating thesamecycle of operations as to the remaining tanks,

lltlll lllll treating suiphur A solvent t0 flow through :i

suceessnreiy alternately through Mich-- 125. The herein describedprocess of em from asuhstence with piecing the tanks, .permittlng ewhich it is mixed consisting in. substance in series at heater and thentionei'heaters and the remaining tanks, conmeeting new tenhfo the seriesand permitting the solvent to flew therethi'ough when all the sulphurhas been extracted from the mining the first heater and first ee in thefirst tank, forcing the SDi.-

tank into the sueeeeeiizigheeters anti tanks by fluid pressuz' cuttingthe first tank out of the series and thereafter repeating the if seineeyeie 01" eperetiei'is as to the remaining tanks. 4

Signed at 'l oi em in the county of Merris and State 0% N. 5. h is 14thday of Novemher A. D. 1918.

ARTHUR "GI EN.

Witnesses C. A. TIBBALS, J12, LANG,

